java 无法从 TemporalAccessor 获取 OffsetDateTime
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Unable to obtain OffsetDateTime from TemporalAccessor
提问by asmaier
When I do this
当我这样做时
String datum = "20130419233512";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss").withZone(ZoneId.of("Europe/Berlin"));
OffsetDateTime datetime = OffsetDateTime.parse(datum, formatter);
I get the following exception:
我收到以下异常：
java.time.format.DateTimeParseException: Text '20130419233512' could not be parsed:
Unable to obtain OffsetDateTime from TemporalAccessor: {InstantSeconds=1366407312},ISO,Europe/Berlin resolved
to 2013-04-19T23:35:12 of type java.time.format.Parsed
How can I parse my datetime string so that it is interpreted as always being from the timezone "Europe/Berlin" ?
如何解析我的日期时间字符串，以便将其解释为始终来自“欧洲/柏林”时区？
回答by Tunaki
The problem is that there is a difference between what a ZoneIdis and a ZoneOffsetis. To create a OffsetDateTime, you need an zone offset. But there is no one-to-one mapping between a ZoneIdand a ZoneOffsetbecause it actually depends on the current daylight saving time. For the same ZoneIdlike "Europe/Berlin", there is one offset for summer and a different offset for winter.
问题是 a ZoneIdis 和 a ZoneOffsetis之间存在差异。要创建OffsetDateTime，您需要一个区域偏移量。但是aZoneId和 a之间没有一一对应的关系，ZoneOffset因为它实际上取决于当前的夏令时。对于与ZoneId“欧洲/柏林”一样的情况，夏季有一个偏移量，冬季有不同的偏移量。
For this case, it would be easier to use a ZonedDateTimeinstead of an OffsetDateTime. During parsing, the ZonedDateTimewill correctly be set to the "Europe/Berlin"zone id and the offset will also be set according to the daylight saving time in effect for the date to parse:
对于这种情况，使用 aZonedDateTime而不是会更容易OffsetDateTime。在解析过程中，ZonedDateTime将正确设置为"Europe/Berlin"区域 id，偏移量也将根据解析日期生效的夏令时设置：
public static void main(String[] args) {
String datum = "20130419233512";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss").withZone(ZoneId.of("Europe/Berlin"));
ZonedDateTime datetime = ZonedDateTime.parse(datum, formatter);
System.out.println(datetime.getZone()); // prints "Europe/Berlin"
System.out.println(datetime.getOffset()); // prints "+02:00" (for this time of year)
}
Note that if you really want an OffsetDateTime, you can use ZonedDateTime.toOffsetDateTime()to convert a ZonedDateTimeinto an OffsetDateTime.
请注意，如果您真的想要OffsetDateTime，则可以使用ZonedDateTime.toOffsetDateTime()将 aZonedDateTime转换为OffsetDateTime。
回答by Matt Johnson-Pint
There's no offset in your source data, and thus OffsetDateTimeis not the correct type to use during parsing.
您的源数据中没有偏移量，因此OffsetDateTime在解析过程中使用的类型不正确。
Instead, use a LocalDateTime, since that is the type that most closely resembles the data you have. Then use atZoneto assign it a time zone, and if you still need an OffsetDateTime, you can call toOffsetDateTimefrom there.
相反，请使用 a LocalDateTime，因为这是与您拥有的数据最相似的类型。然后使用atZone给它分配一个时区，如果你仍然需要一个OffsetDateTime，你可以toOffsetDateTime从那里调用。
String datum = "20130419233512";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");
LocalDateTime datetime = LocalDateTime.parse(datum, formatter);
ZonedDateTime zoned = datetime.atZone(ZoneId.of("Europe/Berlin"));
OffsetDateTime result = zoned.toOffsetDateTime();
